Description
An issue was discovered in PostCSS before 8.4.31. The vulnerability affects linters using PostCSS to parse external untrusted CSS. An attacker can prepare CSS in such a way that it will contains parts parsed by PostCSS as a CSS comment. After processing by PostCSS, it will be included in the PostCSS output in CSS nodes (rules, properties) despite being included in a comment.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | node-postcss | 8.4.31+~cs8.0.26-1 | — |
| Debian 13 | node-postcss | 8.4.31+~cs8.0.26-1 | — |
| Debian 12 | node-postcss | 8.4.20+~cs8.0.23-1+deb12u1 | — |
| Debian 11 | node-postcss | 8.2.1+~cs5.3.23-8+deb11u1 | DLA-4003-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | node-postcss | No fix yet | — |
| Ubuntu 26.04 LTS | node-postcss | No fix yet | — |
| Ubuntu 25.10 | node-postcss | No fix yet | — |
| Ubuntu 24.04 LTS | node-postcss | No fix yet | — |
| Ubuntu 22.04 LTS | node-postcss | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | node-postcss | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | velociraptor | 0.7.0.4.git142.862ef23-1.1 | openSUSE-SU-2025:14663-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | postcss | < 8.4.31 | 8.4.31 | GHSA-7fh5-64p2-3v2j |
Advisories 7
- DLA-4003-1 node-postcss - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2025:14663-1 velociraptor-0.7.0.4.git142.862ef23-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2026-0180 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 2026
- WID-SEC-2023-2964 Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 24, 2025
- WID-SEC-2024-3577 Red Hat OpenShift: Schwachstelle ermöglicht Manipulation von Daten BSI CERT-Bund (WID) · Mar 10, 2025
- WID-SEC-2024-0858 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 20, 2024
- WID-SEC-2024-0753 IBM Business Automation Workflow: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2024